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Method for removing surface coating of titanium pipe and titanium alloy pipe

A surface coating, titanium alloy technology, applied in the field of titanium pipe processing, can solve the problems of large nitrogen oxides smog, environmental and operator hazards, and achieve the effect of simple site requirements, low environmental pollution, and low investment

Inactive Publication Date: 2011-10-05
WESTERN TITANIUM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the surface cladding layer of the prepared pipe must be removed before rolling. At present, the method widely used in China is to soak and remove it with heated nitric acid solution. During the soaking process, a large amount of nitrogen oxide fumes are generated. It is more harmful to the environment and operators, and there is no better way to replace it

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) FeCl 3 and HCl are added to water to prepare Fe 3+ A solution with a concentration of 3mol / L and a pH value of 3, and then heat the solution to 55°C;

[0023] (2) Soak the titanium pipe material covered with the copper sheath on the surface in the solution at a temperature of 55° C. in the step (1), and simultaneously feed compressed air into the solution so that the flow velocity of the solution is 0.5 m / s, The pressure of compressed air is 0.3MPa, and the flow rate of compressed air is 20L / (s m 2 ), take out the titanium pipe after the copper sheath coated on the surface of the titanium pipe is completely dissolved;

[0024] (3) Rinse the titanium pipe taken out in step (2) with hot water at 30°C and dry it;

[0025] (4) Using a steel plate as an anode and a copper plate as a cathode, electrolyzing the solution soaked in the titanium pipe in step (2), recovering non-ferrous metal ions in the solution, the electrolysis voltage is 0.5V.

[0026] In this example,...

Embodiment 2

[0028] (1) FeCl 3 and HCl are added to water to prepare Fe 3+ A solution with a concentration of 2mol / L and a pH value of 1, and then heat the solution to 70°C;

[0029] (2) Soak the titanium tubing covered with a steel clad on the surface in the solution at a temperature of 70°C as described in step (1), and simultaneously feed compressed air into the solution so that the flow velocity of the solution is 2m / s, and the compressed air The pressure is 0.6MPa, the flow rate of compressed air is 20L / (s·m 2 ), take out the titanium pipe after the steel ladle covering the surface of the titanium pipe is completely dissolved;

[0030] (3) Rinse the titanium pipe taken out in step (2) with hot water at 60°C and dry it;

[0031] (4) Using a steel plate as an anode and a copper plate as a cathode, electrolyzing the solution soaked in the titanium pipe in step (2), recovering non-ferrous metal ions in the solution, the electrolysis voltage is 0.5V.

[0032] In this example, FeCl 3 C...

Embodiment 3

[0034] (1) FeCl 3 and HCl are added to water to prepare Fe 3+ A solution with a concentration of 2.5mol / L and a pH value of 2, and then heat the solution to 60°C;

[0035] (2) Soak the titanium alloy pipe covered with a copper sheath on the surface in the solution at a temperature of 60°C as described in step (1), and at the same time pass compressed air into the solution so that the flow velocity of the solution is 1.5m / s , the pressure of compressed air is 0.45MPa, and the flow rate of compressed air is 20L / (s·m 2 ), take out the titanium alloy pipe after the copper sheath coated on the surface of the titanium alloy pipe is completely dissolved;

[0036] (3) Rinse the titanium alloy pipe taken out in step (2) with hot water at 45°C and dry it;

[0037] (4) Using a steel plate as an anode and a copper plate as a cathode, electrolyzing the solution soaked in the titanium alloy pipe in step (2), recovering non-ferrous metal ions in the solution, the electrolysis voltage is 0...

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Abstract

The invention discloses a method for removing the surface coating of a titanium pipe and a titanium alloy pipe. The method comprises the following steps of: firstly, mixing FeCl3, HCL and water into a solution; then soaking the titanium pipe or the titanium alloy pipe in the solution; removing the coating on the surface of the titanium pipe and the titanium alloy pipe through chemical reaction of FeCl3 in the solution and the coating on the surface of the titanium pipe or the titanium alloy pipe; meanwhile, charging compressed air into the solution to convert Fe<2+> in the solution into Fe<3+> so as to recycle the solution; and finally, recovering non-ferrous metal ions in the solution in which the titanium pipe or the titanium alloy pipe is soaked through electrolysis. The method disclosed by the invention has the advantages of simple operation process, simple field requirement, less investment and less pollution to the environment; and in a processing process, no corrosion is generated on a titanium pipe or titanium alloy pipe matrix through the solution, no waste gas and no nitric oxide smoke are generated and no damages are caused to the environment and operators.

Description

technical field [0001] The invention belongs to the technical field of titanium pipe processing, and in particular relates to a method for removing a coating layer on the surface of titanium pipes and titanium alloy pipes. Background technique [0002] Titanium pipes are widely used in chemical industry, aerospace and other fields due to their excellent corrosion resistance and high specific strength. The preparation technology of titanium pipes is currently divided into two types: cross rolling piercing and extrusion. Among them, the extrusion process is always subject to three-dimensional compressive stress during the extrusion process, so the inner and outer surfaces of the produced pipes are smooth and have few defects, which can meet the technical conditions of pipes with relatively high requirements for finished products. This process is currently widely used. [0003] When the extrusion process is used, the inner and outer surfaces of the titanium extruded pipe must b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/10C25C1/00
Inventor 杨亚社王伟杨永福杨建朝
Owner WESTERN TITANIUM TECH
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